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//
// Copyright 2016 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#pragma once
#include <map>
#include <mutex>
#include <thread>
namespace android {
namespace hardware {
namespace bluetooth {
namespace async {
using ReadCallback = std::function<void(int)>;
using TimeoutCallback = std::function<void(void)>;
class AsyncFdWatcher {
public:
AsyncFdWatcher() = default;
~AsyncFdWatcher();
int WatchFdForNonBlockingReads(int file_descriptor,
const ReadCallback& on_read_fd_ready_callback);
int ConfigureTimeout(const std::chrono::milliseconds timeout,
const TimeoutCallback& on_timeout_callback);
void StopWatchingFileDescriptors();
private:
AsyncFdWatcher(const AsyncFdWatcher&) = delete;
AsyncFdWatcher& operator=(const AsyncFdWatcher&) = delete;
int tryStartThread();
int stopThread();
int notifyThread();
void ThreadRoutine();
std::atomic_bool running_{false};
std::thread thread_;
std::mutex internal_mutex_;
std::mutex timeout_mutex_;
std::map<int, ReadCallback> watched_fds_;
int notification_listen_fd_;
int notification_write_fd_;
TimeoutCallback timeout_cb_;
std::chrono::milliseconds timeout_ms_;
};
} // namespace async
} // namespace bluetooth
} // namespace hardware
} // namespace android
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